Effect of Stenosis Asymmetry on Blood Flow and Artery Compression: A Three-Dimensional Fluid-Structure Interaction Model

2003 ◽  
Vol 31 (10) ◽  
pp. 1182-1193 ◽  
Author(s):  
Dalin Tang ◽  
Chun Yang ◽  
Shunichi Kobayashi ◽  
Jie Zheng ◽  
Raymond P. Vito
Keyword(s):  
Blood Flow ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Interaction Model ◽  
Fluid Structure ◽  
Structure Interaction

Modeling of aortic valve stenosis using fluid-structure interaction method

Perfusion ◽  
2021 ◽  
pp. 026765912199854
Author(s):  
Mohammad Javad Ghasemi Pour ◽  
Kamran Hassani ◽  
Morteza Khayat ◽  
Shahram Etemadi Haghighi
Keyword(s):  
Blood Flow ◽  
Aortic Valve ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Relaxation Phase ◽  
Exercise Condition ◽  
Time Dependent Domain ◽  
Comparison Of The Results

Background and objectives: Fluid structure interaction (FSI) is defined as interaction of the structures with contacting fluids. The aortic valve experiences the interaction with blood flow in systolic phase. In this study, we have tried to predict the hemodynamics of blood flow through a normal and stenotic aortic valve in two relaxation and exercise conditions using a three-dimensional FSI method. Methods: The aorta valve was modeled as a three-dimensional geometry including a normal model and two others with 25% and 50% stenosis. The geometry of the aortic valve was extracted from CT images and the models were generated by MMIMCS software and then they were implemented in ANSYS software. The pulsatile flow rate was used for all cases and the numerical simulations were conducted based on a time-dependent domain. Results: The obtained results including the velocity, pressure, and shear stress contours in different systolic time sequences were explained and discussed. The maximum blood flow velocity in relaxation phase was obtained 1.62 m/s (normal valve), 3.78 m/s (25% stenosed valve), and 4.73 m/s (50% stenosed valve). In exercise condition, the maximum velocities are 2.86, 4.32, and 5.42 m/s respectively. The maximum blood pressure in relaxation phase was calculated 111.45 mmHg (normal), 148.66 mmHg (25% stenosed), and 164.21 mmHg (50% stenosed). However, the calculated values in exercise situation were 129.57, 163.58, and 191.26 mmHg. The validation of the predicted results was also conducted using existing literature. Conclusions: We believe that such model are useful tools for biomechanical experts. The further studies should be done using experimental data and the data are implemented on the boundary conditions for better comparison of the results.

scholarly journals Estimation of maximum intraventricular pressure: a three-dimensional fluid–structure interaction model

2013 ◽  
Vol 12 (1) ◽  
pp. 122 ◽  
Author(s):  
Hamidreza Bahraseman ◽  
Kamran Hassani ◽  
Arezoo khosravi ◽  
Mahdi Navidbakhsh ◽  
Daniel M Espino ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Interaction Model ◽  
Intraventricular Pressure ◽  
Fluid Structure ◽  
Structure Interaction

Towards a Parallel Implementation of an Immersed Boundary Method on Non-Uniform Cartesian Mesh Coupled With a Fluid Structure Interaction Model

2014 ◽  
Author(s):  
Z. Wei ◽  
Z. C. Zheng
Keyword(s):  
Immersed Boundary Method ◽  
Parallel Implementation ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Interaction Model ◽  
Immersed Boundary ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Cartesian Mesh ◽  
Boundary Method

The immersed boundary methods are well known as an efficient flow solver for engineering problems involving fluid structure interactions. However, in order to obtain better results, higher resolutions near the immersed boundary points are desired. Non-uniform Cartesian mesh can easily fulfill this task without introducing a dramatic increase on the cost of computation and coding. In the current paper, an immersed boundary method with non-uniform Cartesian mesh is demonstrated. The Poisson problem is solved with assistance of a scientific parallel computational library PETSc. The code is validated with a three-dimensional flow over a stationary sphere. Then, a fluid-structure interaction model is coupled and validated with two-dimensional vortex induced vibration problems. Comparisons with previous studies are presented. The ultimate goal is to couple the fluid-structure interaction model with the three-dimensional immersed boundary method.

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